After entering, the dirt road to the right takes you to camping in front of the Mexican Hat there’s quite a few spots that are big rig friendly. The first road to the left I’d advise for slightly smaller rigs, but I took my short bus down there just fine. Down the hill there’s Mexican Hat Rd which seems to stretch forever. A wide variety of spots and all a close walk to the river. There’s also a dirt road that veers down - I’d only recommend for 4x4 high clearance vehicles, and probably not if it’s too wet. If you follow that road all the way down there’s actually a white sand beach to play in the water.